Semiheavy water

Deuterium hydrogen oxide

Names
IUPAC name (O-2H1)Water
Other names Deuterium hydrogen monoxide Deuterium hydrogen oxide, Water-d1 , Water-d
Identifiers
3D model (Jmol)	Interactive image
ChEBI	CHEBI:33806
ChemSpider	123344
InChI InChI=1S/H2O/h1H2/i/hD Key: XLYOFNOQVPJJNP-DYCDLGHISA-N
SMILES [2H]O
Properties
Chemical formula	H2HO (also HDO)
Molar mass	19.0214 g mol−1
Appearance	Very pale blue, transparent liquid, very similar to regular water
Density	1.054 g cm−3
Melting point	3.81 °C (38.86 °F; 276.96 K)
Boiling point	101.42 °C (214.56 °F; 374.57 K)
Solubility in water	Reacts
log P	−0.65
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Semiheavy water is the result of replacing one of the protium in light water to deuterium. It exists whenever there is water with light hydrogen (protium, ¹H) and deuterium (D or²H) in the mix. This is because hydrogen atoms (hydrogen-1 and deuterium) are rapidly exchanged between water molecules. Water containing 50% H and 50% D in its hydrogen actually contains about 50% HDO and 25% each of H₂O and D₂O, in dynamic equilibrium. In regular water, about 1 molecule in 3,200 is HDO (one hydrogen in 6,400 is D). By comparison, heavy water D₂O occurs at a proportion of about 1 molecule in 41 million (i.e., one in 6,400²). This makes semiheavy water far more common than "normal" heavy water.

The freezing point of semiheavy water is close to the freezing point of heavy water. (3.8°C)

External links

• OH stretching vibrations in HOD